Lumentum Holdings Inc. to Join the Nasdaq-100 Index® Beginning May 18, 2026

Nasdaq (Nasdaq: NDAQ) announced that Lumentum (Nasdaq: LITE) will join the Nasdaq-100 Index replacing CoStar Group (Nasdaq: CSGP) prior to market open on May 18, 2026.

Rhea-AI Summary

Nasdaq (Nasdaq: NDAQ) announced that Lumentum (Nasdaq: LITE) will join the Nasdaq-100 Index replacing CoStar Group (Nasdaq: CSGP) prior to market open on May 18, 2026.

Index changes take effect before market open on the stated date; additional index notifications are available from Nasdaq.

Positive

• Lumentum (Nasdaq: LITE) will join the Nasdaq-100 Index effective May 18, 2026

Negative

• CoStar Group (Nasdaq: CSGP) will be removed from the Nasdaq-100 Index effective May 18, 2026

Argus May 11 session

-0.48% close to close Open Argus

Details

News Market Reaction – NDAQ

In the May 11 session, NDAQ declined 0.48%, reflecting a mild negative market reaction.

Data tracked by StockTitan Argus on the day of publication.

Market Context

This announcement highlights a change in the Nasdaq‑100 Index, with Lumentum set to join the benchma...

Analysis

This announcement highlights a change in the Nasdaq‑100 Index, with Lumentum set to join the benchmark on May 18, 2026. For Nasdaq, it represents ongoing maintenance of a key index product rather than a direct financial catalyst. Placed alongside recent routine volume updates, short‑interest reports, and dividend decisions, it fits a pattern of incremental disclosures. Investors may watch how index changes influence trading and product demand over time.

Key Figures

Index change effective date: May 18, 2026

Index change effective date

May 18, 2026

Effective date Lumentum joins Nasdaq-100 Index

Historical Context

5 past events · Latest: May 05

5 events

1. May 05

   Monthly volume data

   24h Move

   +0.2%

   Reported April 2026 trading volumes and posted detailed data sheet.

2. Apr 29

   Employee benefit update

   24h Move

   -0.0%

   Announced matching $1,000 Trump Accounts contribution for eligible U.S. employees’ children.

3. Apr 27

   Trading resumption

   24h Move

   +0.6%

   Resumed trading in American Rebel Holdings securities after prior halt.

4. Apr 24

   Short interest report

   24h Move

   +0.6%

   Released mid‑month open short interest statistics across Nasdaq markets.

5. Apr 23

   Dividend increase

   24h Move

   +0.8%

   Increased regular quarterly dividend to $0.31 per share with June 2026 payment.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Key Terms

Nasdaq-100 Index

1 terms

Nasdaq-100 Index financial

"will become a component of the Nasdaq-100 Index® replacing CoStar Group"

A stock market index made up of the 100 largest non-financial companies listed on the Nasdaq exchange, ranked by the total value of their publicly traded shares. Think of it as a single basket or scoreboard that tracks how a group of prominent, mostly tech- and growth-oriented firms are performing together; investors use it as a benchmark to gauge market trends, build funds or ETFs, and get broad exposure to large-cap Nasdaq-listed stocks.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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NEW YORK, May 08, 2026 (GLOBE NEWSWIRE) -- Nasdaq (Nasdaq: NDAQ) today announced that Lumentum Holdings Inc. (Nasdaq: LITE) will become a component of the Nasdaq-100 Index^® replacing CoStar Group, Inc. (Nasdaq: CSGP) prior to market open on Monday, May 18, 2026.

For additional information, including notifications on changes to any Nasdaq Indexes, please go to https://indexes.nasdaq.com/

About Nasdaq Global Indexes
Nasdaq Global Indexes is one of the world's leading index providers, offering a comprehensive suite of rules-based benchmarks and indexes. The Nasdaq-100 Index^® — which measures the performance of 100 of the largest Nasdaq-listed non-financial companies — is tracked by more than 200 investment products with over $600 billion in assets under management globally. Nasdaq Global Indexes publishes and maintains more than 35,000 indexes across asset classes and geographies.

About Nasdaq
Nasdaq (Nasdaq: NDAQ) is a global technology company serving the capital markets and other industries. Our diverse offering of data, analytics, software, and services enables clients to optimize and execute their business vision with confidence. To learn more about the company, technology solutions, and career opportunities, visit us on LinkedIn, on X @Nasdaq, or at www.nasdaq.com.

The information contained above is provided for informational and educational purposes only, and nothing contained herein should be construed as investment advice, either on behalf of a particular financial product or an overall investment strategy. Neither Nasdaq, Inc. nor any of its affiliates makes any recommendation to buy or sell any financial product or any representation about the financial condition of any company or fund. Statements regarding Nasdaq’s proprietary indexes are not guarantees of future performance. Actual results may differ materially from those expressed or implied. Past performance is not indicative of future results. Investors should undertake their own due diligence and carefully evaluate companies before investing. ADVICE FROM A SECURITIES PROFESSIONAL IS STRONGLY ADVISED.

Media Contact:
Maximilian Leitenberger
Maximilian.leitenberger@nasdaq.com

Issuer & Investor Contact:
Index Client Services, Nasdaq
Indexservices@nasdaq.com

-NDAQG-

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

When will Lumentum (LITE) be added to the Nasdaq-100 Index?

Lumentum will be added to the Nasdaq-100 Index prior to market open on May 18, 2026. According to Nasdaq, the change replaces CoStar Group and takes effect before trading begins on that date.

Which company is being removed from the Nasdaq-100 when Lumentum (LITE) is added?

CoStar Group (Nasdaq: CSGP) will be removed from the Nasdaq-100 Index effective May 18, 2026. According to Nasdaq, CoStar is the component being replaced by Lumentum in the index.

How can investors verify the Nasdaq-100 change for Lumentum (LITE)?

Investors can confirm the index change on Nasdaq's index website and notifications. According to Nasdaq, additional information and updates are available at indexes.nasdaq.com.

Will the Nasdaq-100 inclusion for Lumentum (LITE) take effect during trading hours?

No, the inclusion takes effect prior to market open on May 18, 2026. According to Nasdaq, index component changes are implemented before the trading day begins on the effective date.

What ticker symbols are involved in the Nasdaq-100 change on May 18, 2026?

The change involves Lumentum (Nasdaq: LITE) joining and CoStar Group (Nasdaq: CSGP) being removed from the Nasdaq-100. According to Nasdaq, the swap is effective May 18, 2026.